// SHA1
function add(x, y) {
	return((x & 0x7FFFFFFF) + (y & 0x7FFFFFFF)) ^ (x & 0x80000000) ^ (y & 0x80000000);
}
 
function SHA1hex(num) {
	var sHEXChars = "0123456789abcdef";
	var str = "";
	for(var j = 7; j >= 0; j--)
		str += sHEXChars.charAt((num >> (j * 4)) & 0x0F);
	return str;
}
 
function AlignSHA1(sIn) {
	var nblk = ((sIn.length + 8) >> 6) + 1,
		blks = new Array(nblk * 16);
	for(var i = 0; i < nblk * 16; i++) blks[i] = 0;
	for(i = 0; i < sIn.length; i++)
		blks[i >> 2] |= sIn.charCodeAt(i) << (24 - (i & 3) * 8);
	blks[i >> 2] |= 0x80 << (24 - (i & 3) * 8);
	blks[nblk * 16 - 1] = sIn.length * 8;
	return blks;
}
 
function rol(num, cnt) {
	return(num << cnt) | (num >>> (32 - cnt));
}
 
function ft(t, b, c, d) {
	if(t < 20) return(b & c) | ((~b) & d);
	if(t < 40) return b ^ c ^ d;
	if(t < 60) return(b & c) | (b & d) | (c & d);
	return b ^ c ^ d;
}
 
function kt(t) {
	return(t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
		(t < 60) ? -1894007588 : -899497514;
}
//主函数 
function SHA1(sIn) {
	var x = AlignSHA1(sIn);
	var w = new Array(80);
	var a = 1732584193;
	var b = -271733879;
	var c = -1732584194;
	var d = 271733878;
	var e = -1009589776;
	for(var i = 0; i < x.length; i += 16) {
		var olda = a;
		var oldb = b;
		var oldc = c;
		var oldd = d;
		var olde = e;
		for(var j = 0; j < 80; j++) {
			if(j < 16) w[j] = x[i + j];
			else w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
			t = add(add(rol(a, 5), ft(j, b, c, d)), add(add(e, w[j]), kt(j)));
			e = d;
			d = c;
			c = rol(b, 30);
			b = a;
			a = t;
		}
		a = add(a, olda);
		b = add(b, oldb);
		c = add(c, oldc);
		d = add(d, oldd);
		e = add(e, olde);
	}
	SHA1Value = SHA1hex(a) + SHA1hex(b) + SHA1hex(c) + SHA1hex(d) + SHA1hex(e);
	return SHA1Value.toUpperCase();
}
//小写的 
function SHA2(sIn) {
	return SHA1(sIn).toLowerCase();
}
